The Tor Browser / file comparison
comparison: mobile/android/base/sync/synchronizer/SerialRecordConsumer.java
mobile/android/base/sync/synchronizer/SerialRecordConsumer.java
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
equal
deleted
inserted
replaced
| -1:000000000000 | 0:5593febdcac2 |
|---|---|
| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 package org.mozilla.gecko.sync.synchronizer; | |
| 6 | |
| 7 import org.mozilla.gecko.background.common.log.Logger; | |
| 8 import org.mozilla.gecko.sync.repositories.domain.Record; | |
| 9 | |
| 10 /** | |
| 11 * Consume records from a queue inside a RecordsChannel, storing them serially. | |
| 12 * @author rnewman | |
| 13 * | |
| 14 */ | |
| 15 class SerialRecordConsumer extends RecordConsumer { | |
| 16 private static final String LOG_TAG = "SerialRecordConsumer"; | |
| 17 protected boolean stopEventually = false; | |
| 18 private volatile long counter = 0; | |
| 19 | |
| 20 public SerialRecordConsumer(RecordsConsumerDelegate delegate) { | |
| 21 this.delegate = delegate; | |
| 22 } | |
| 23 | |
| 24 private Object monitor = new Object(); | |
| 25 @Override | |
| 26 public void doNotify() { | |
| 27 synchronized (monitor) { | |
| 28 monitor.notify(); | |
| 29 } | |
| 30 } | |
| 31 | |
| 32 @Override | |
| 33 public void queueFilled() { | |
| 34 Logger.debug(LOG_TAG, "Queue filled."); | |
| 35 synchronized (monitor) { | |
| 36 this.stopEventually = true; | |
| 37 monitor.notify(); | |
| 38 } | |
| 39 } | |
| 40 | |
| 41 @Override | |
| 42 public void halt() { | |
| 43 Logger.debug(LOG_TAG, "Halting."); | |
| 44 synchronized (monitor) { | |
| 45 this.stopEventually = true; | |
| 46 this.stopImmediately = true; | |
| 47 monitor.notify(); | |
| 48 } | |
| 49 } | |
| 50 | |
| 51 private Object storeSerializer = new Object(); | |
| 52 @Override | |
| 53 public void stored() { | |
| 54 Logger.debug(LOG_TAG, "Record stored. Notifying."); | |
| 55 synchronized (storeSerializer) { | |
| 56 Logger.debug(LOG_TAG, "stored() took storeSerializer."); | |
| 57 counter++; | |
| 58 storeSerializer.notify(); | |
| 59 Logger.debug(LOG_TAG, "stored() dropped storeSerializer."); | |
| 60 } | |
| 61 } | |
| 62 private void storeSerially(Record record) { | |
| 63 Logger.debug(LOG_TAG, "New record to store."); | |
| 64 synchronized (storeSerializer) { | |
| 65 Logger.debug(LOG_TAG, "storeSerially() took storeSerializer."); | |
| 66 Logger.debug(LOG_TAG, "Storing..."); | |
| 67 try { | |
| 68 this.delegate.store(record); | |
| 69 } catch (Exception e) { | |
| 70 Logger.warn(LOG_TAG, "Got exception in store. Not waiting.", e); | |
| 71 return; // So we don't block for a stored() that never comes. | |
| 72 } | |
| 73 try { | |
| 74 Logger.debug(LOG_TAG, "Waiting..."); | |
| 75 storeSerializer.wait(); | |
| 76 } catch (InterruptedException e) { | |
| 77 // TODO | |
| 78 } | |
| 79 Logger.debug(LOG_TAG, "storeSerially() dropped storeSerializer."); | |
| 80 } | |
| 81 } | |
| 82 | |
| 83 private void consumerIsDone() { | |
| 84 long counterNow = this.counter; | |
| 85 Logger.info(LOG_TAG, "Consumer is done. Processed " + counterNow + ((counterNow == 1) ? " record." : " records.")); | |
| 86 delegate.consumerIsDone(stopImmediately); | |
| 87 } | |
| 88 | |
| 89 @Override | |
| 90 public void run() { | |
| 91 while (true) { | |
| 92 synchronized (monitor) { | |
| 93 Logger.debug(LOG_TAG, "run() took monitor."); | |
| 94 if (stopImmediately) { | |
| 95 Logger.debug(LOG_TAG, "Stopping immediately. Clearing queue."); | |
| 96 delegate.getQueue().clear(); | |
| 97 Logger.debug(LOG_TAG, "Notifying consumer."); | |
| 98 consumerIsDone(); | |
| 99 return; | |
| 100 } | |
| 101 Logger.debug(LOG_TAG, "run() dropped monitor."); | |
| 102 } | |
| 103 // The queue is concurrent-safe. | |
| 104 while (!delegate.getQueue().isEmpty()) { | |
| 105 Logger.debug(LOG_TAG, "Grabbing record..."); | |
| 106 Record record = delegate.getQueue().remove(); | |
| 107 // Block here, allowing us to process records | |
| 108 // serially. | |
| 109 Logger.debug(LOG_TAG, "Invoking storeSerially..."); | |
| 110 this.storeSerially(record); | |
| 111 Logger.debug(LOG_TAG, "Done with record."); | |
| 112 } | |
| 113 synchronized (monitor) { | |
| 114 Logger.debug(LOG_TAG, "run() took monitor."); | |
| 115 | |
| 116 if (stopEventually) { | |
| 117 Logger.debug(LOG_TAG, "Done with records and told to stop. Notifying consumer."); | |
| 118 consumerIsDone(); | |
| 119 return; | |
| 120 } | |
| 121 try { | |
| 122 Logger.debug(LOG_TAG, "Not told to stop but no records. Waiting."); | |
| 123 monitor.wait(10000); | |
| 124 } catch (InterruptedException e) { | |
| 125 // TODO | |
| 126 } | |
| 127 Logger.debug(LOG_TAG, "run() dropped monitor."); | |
| 128 } | |
| 129 } | |
| 130 } | |
| 131 } |
